Machine for drawing patterns.



PATENTED APR, 14, 1903. J. G. BRADLEY & T. H. GILBERT. MACHINE FORDRAWING PATTERNS.

APPLICATION FILED AUG. 6, 1902.

.NO MODEL.

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UN TED STATES PATENT OFFICE.

JOHN COLLINS BRADLEY AND TRUMAN H. GILBERT, OF BUFFALO, NE\V YORK,ASSIGNORS TO PRATT & LETCHWORTH COMPANY, OF BUFFALO,

NEW YORK.

MACHINE FoR DRAWING PATTERNS.

SPECIFICATION forming part of Letters Patent'lNo. 725,210, dated April'14, 1903,.

Application filed August 6, 1902.

To all whom it may concern.-

Be it known that we, JOHN COLLINS BRAD.- LEY and TRUMAN H. GILBERT,citizens of the United States, residing at Buffalo, in the county ofErie and State of New York, have invented new and useful Improvements inMachines for Drawing Patterns from Molds, of which the following is aspecification.

This invention relates to a machine for m drawing patterns from molds,such as sand molds, in which a vertically-movable drawing device isarranged above a mold-support and is provided with means for attachingit to the pattern in a mold placed on the support and with means forraising the drawing device to draw the pattern up out of the mold.

The match which supports the pattern While the mold or first section ofthe mold is being packed or rammed is not always made accurate, and thepattern is not supported in a true level or horizontal position. Afterthe mold is completed it requires an expert molder to draw the patternfrom the mold without injuring or breaking the latter, or if the patternis drawn by a drawing device the mold will also be injured unlessprovision is made for relatively adjusting the position of the drawingdevice and mold-support to accommodate the untrue position of thepattern in the mold.

The object of the present invention is to provide an exceedingly simpleand inexpensive machine for drawing patterns in which the relativeposition of the mold-support and drawing device can be quickly andeasily adjusted to accommodate inaccuracies in the mold or'whenadjustment is required for any other reason.

In the accompanying drawings, Figure 1 is a side elevation, partly insection, of a pattern-drawing machine embodying theinvention. Fig. 2 isa front elevation thereof. Fig. 3 is a fragmentary section through thedrawing-head in line 3 3, Fig. 1. Fig. 4 is a section through the upperclamp and hingeblock for the mold-table in line 4 4:, Fig. 1. Fig. 5 isa section through the lower clamp and hinge-block in line 5 5, Fig. 1.

Serial No. 118,619. (No modela) Like letters of reference refer to likeparts in the several figures.

A represents the mold support or table on which the mold is supportedwhile being formed and the pattern drawn, B the drawing device, which isarranged over the mold-table, and C the standard, which supports themold-table and drawing device.

The mold-table is bodily adjustable vertically on the standard to placeit at the desired height to suit the workman and is also universallyadjustable to place it in true horizontal position or correct relativeposition to the drawing device. The mold-table is hinged at its inner orrear end to an upper hingeblock D on the standard and at its outer orfront end is supported by an inclined brace or frame E, which is hingedat its upper end to the under side of the table and at its lower end toa lower hinge-block F on the standard. The hinge-blocks are connected tothe standard by brackets or clamps, which are adjustable vertically onthe standard. 'In the construction shown the standard is in the form ofan Lbeam, and each clamp consists of two side pieces 6, arranged onopposite sides of the standards and which extend in between the flangesof the I-beams and bear against the opposite sides of its web. The sidepieces are firmly clamped on the standard by a bolt 6, which passesthrough the side pieces and through a vertically-elongated slot 5 in theweb of the I-beam. The side pieces are connected by a front plate 6which extends across the front face of the I-beam and is secured to theside pieces by bolts e. The upper hinge-block is pivoted centrally toswing in a vertical plane on a bolt f; which extends through a hole inthe hinge-block and is screwed into a threaded hole in the front plate eof the upper clamp. The bolts 6 which connect the front plate of theside piece of the upper clamp, pass through slots f, which are formed inthehinge-plate on opposite sides of its pivot-bolt and are curvedconcentric with said pivot-bolt. The lower hinge-block is provided witha long slot g, which is curved concentric with the pivotbolt f for theupper hinge-block, and through this slot passes a clamping-bolt 9 whichis screwed into a threaded hole in the front plate of the lower clamp.When it is desired to elevate or depress the front portion of the tableto adjust it relative to the drawing device, the clamp-bolt e for thelower clamp is loosened and the clamp moved up or down on the standardto the desired extent, so as to raise or lower the brace and the frontend of the table, the latter swinging on its hinge connection with theupper hinge-block. The

. clamp is fixed when adjusted by tightening the clainp-bolte. Thesidewise adjustment is accomplished by loosening the clampingbolts 6 ofthe upper hinge-block and g for the lower hinge-block, when the table,brace, and hinge-blocks can be swung or tilted sidewise on thepivot-bolt f for the upper hinge-block. When the desired adjustment ishad, the table is fixed by tightening the bolts e and The table is thusuniversally adjustable on the clamps.

The drawing device B comprises a rod or stem h, which is verticallymovable in a bearing on a drawing-head h and is provided at its lowerend with any suitable means for attaching it to the pattern. As shown,the rod is provided with a socket 71 in which a stem on the pattern isadapted to enter and be held by a set-screw 7?, carried by the socket.The drawing-rod is raised and lowered by suitable means. For thispurpose a gearwheel I is shown, which is secured to a shaft 1 and mesheswith rack-teeth on the drawingrod. The shaft 01 is journaled in suitablehearings on the head and is provided with an operating-lever t".

J represents a spring-latch for holding the drawing-rod in its raisedposition. Thelatch is in the form of a pin, which is arranged in apocket on the head and is pressed toward the gear-wheel by a spring.When the drawing-rod is in its raised position, the inner end of thelatch-pin springs into a hole or depres- I sion in the face of thegear-wheel and holds the latter from turning. When the drawingrod is tobe again lowered, the latch-pin is pulled out to free the gear-wheel.

The drawing-head is mounted on the outer end of an arm or bracket K,which is hinged on the standard, so that the head can be swung to aposition vertically over the moldtable when the pattern is to be drawn,or back to one side, where it is out of the way of the workman when heis makinga mold. In the construction shown the arm is pivoted on avertical pin 70, which is supported at its upper and lower ends by lugsprojecting forwardly from the clamps is, which are constructed andadjustably secured on the standard, similar to the clamps for themold-table. This manner of mounting the arm on the standard enables thedrawing device to be fixed at the proper height to suit different sizesof molds.

The drawing-head shown is universally ad justable on the arm K, so thatthe drawingrod can be properly adjusted relative to the mold-table whenit is impractical or not desirable to change the position of the table.The head is provided with rearwardly-projecting vertical fins l, whichstraddle a rib Z on a pivoted plate 1*. Bolts Z ,passing through holesin the rib and fins, hold the parts together and permit a forward andbackward tilting movement of the head. The swivelplate is pivoted toswing from side to side on the arm by a bolt Z M represents gages orstops adj ustably secured to the mold-table. The mold is placed againstthese stops when set on the table.

In the use of the machine, assuming the parts to be in the positionindicated, the workman swings the drawing device B to one side out ofthe way and forms the mold on the table A in the usual manner. The pattern is then drawn by swinging the arm K around over the table,releasing the springlatch J, lowering the drawing-rod h, and at tachingit to the stem on the pattern and raising the drawing-rod by means ofits operating-lever t" until the spring-latch J engages in the hole inthe gear-wheel. The proper adjustments of the machine are made by acompetent person in accordance with the requirements of the mold to beoperated upon, and thereafter the machine can be operated and thepattern properly and rapidly drawn by an unskilled laborer.

We claim as our invention 1. The combination of a mold-support,,a

pattern-drawing device, a block to which one of said devices is pivoted,and a support to which said block is pivoted to turn about an axis at anangle to the axis of the pivotal connection between said block and saiddevice, substantially as set forth.

2. The combination of a standard, a pattern-drawing device mounted onsaid standard, devices vertically adjustable on said standard, and amold-support supported by and universally adjustable on said devices,substantially as set forth.

3. The combination of a standard, a pattern-drawing device, a blockpivoted on said standard, a mold-support connected to said block, asecond block movably connected to said standard, and a brace connectedto said mold-support and to said second block, substantially as setforth.

4. The combination of astandard, a hingeblock pivoted on said standard,a mold-support hinged to said hinge-block, a device adjustablevertically on said standard, a second hinge-block movably connected tosaid device, and a brace hinged to said mold-support and to said secondhinge-block, substantially as set forth.

5. The combination of a standard, a hinge block pivoted on the standard,a mold-support hinged to said hinge-block, a device adjustablevertically on said standard, a second hinge-block connected to saiddevice and adapted to move on said device in an arc concentric with thepivot for said first hingeblock, and a brace hinged to said mold-supportand to said second hinge=b10ck, substantially as set forth;

Witness our hands this 28th day of July, 1902.

JOHN COLLINS BRADLEY. TRUMAN H. GILBERT. Witnesses:

MAX FRIEDRICH, DANiEL B. SWEET.

